diff --git a/Makefile b/Makefile
index 60b4922..86df6a6 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ msp430: AR := msp430-elf32-ar
 msp430: CXXFLAGS += -Os -mmcu=msp430g2553 -ffunction-sections -fdata-sections
 msp430: CXXFLAGS += -DMEMDICTSIZE=200
 msp430: LDFLAGS += -L/opt/msp430-elf32/include -Wl,-gc-sections
-msp430: alee-msp430
+msp430: clean-lib alee-msp430
 
 small: CXXFLAGS += -Os
 small: alee
@@ -37,9 +37,12 @@ core.fth.h: alee.dat
 alee.dat: alee core.fth
 	echo "2 sys" | ./alee core.fth
 
-clean:
+clean: clean-lib
 	rm -f alee alee-msp430 alee-standalone
-	rm -f $(LIBFILE) $(OBJFILES) alee.dat core.fth.h
+	rm -f alee.dat core.fth.h
 
-.PHONY: all msp430 small fast standalone clean
+clean-lib:
+	rm -f $(LIBFILE) $(OBJFILES)
+
+.PHONY: all msp430 small fast standalone clean clean-lib
 
diff --git a/README.md b/README.md
index 4f81e0e..e41b628 100644
--- a/README.md
+++ b/README.md
@@ -1,20 +1,33 @@
 # Alee Forth
 
-**Still very much in development! Not suitable for real applications yet.**
-
-Alee is a portable and concise Forth implementation in modern C++. Its primary aims are for reduced program size and execution efficiency. Portability includes bare-metal platforms, with intentions to support microcontrollers with kilobytes of memory.
+Alee is a concise Forth implementation written in modern C++ that aims for portability, minimal program size, and execution efficiency.
 
 ## Cross-platform compatibility
 
-Alee relies on the C++17 standard. Alee *does not* rely on operating-system-specific functions, making portability easy. See the `msp430` target for an example of a port.
+Alee relies on the C++17 standard. Alee *does not* rely on operating-system-specific functions, making portability easy.
+
+The goal of portability extends down to microcontroller targets with kilobytes of memory. See the `msp430` target for an example of a port.
 
-System-specific functionality such as text output is contained to a `sys` word. This word calls a user-supplied `user_sys` C++ function that should implement the necessary (or any additional) system-specific functionality.
+System-specific functionality is obtained through a `sys` Forth word. This word calls a user-supplied C++ function that implements the necessary (or any additional) functionality.
 
 # Forth compatibility
 
-A base dictionary is being built by working through the "core" and "core extension" [glossaries](https://forth-standard.org/standard/core). These glossaries are listed in `compat.txt`, with "yes" indicating that the word is implemented either in `core.fth` or within Alee itself. `core.fth` may be compiled into a binary for loading on targets without filesystems.
+Alee implements a large majority of the "core" and "core extension" [glossaries](https://forth-standard.org/standard/core). Implementation is tracked in `compat.txt`, with missing words listed below. Fundamental words are built into Alee (written in C++); the rest of the implementation is in `core.fth`.
+
+This means Alee should be executed as `alee core.fth` to include these words. Alternatively, the `standalone` target packages the `core.fth` dictionary into the program.
 
-Alee Forth aims for compliance with common Forth standards like Forth 2012 and ANS Forth. Compliance is tested using a [Forth 2012 test suite](https://github.com/gerryjackson/forth2012-test-suite). Supported test files are in the `test` directory, with non-passing or unimplemented tests commented out.
+**Missing** core features:  
+* Pictured numeric output conversion `<# #>`
+* Words for unsigned integers: `U. U< UM* UM/MOD`
+* `>NUMBER`
+* `FIND`
+
+**Missing** core extensions:  
+```
+.R HOLDS PAD PARSE PARSE-NAME REFILL RESTORE-INPUT S\" SAVE-INPUT SOURCE-ID U.R U> UNUSED WITHIN [COMPILE]
+```
+
+Alee aims for compliance with common Forth standards like Forth 2012 and ANS Forth. Compliance is tested using a [Forth 2012 test suite](https://github.com/gerryjackson/forth2012-test-suite). Supported test files are in the `test` directory, with tests for unimplemented words commented out.
 
 ## Building
 
@@ -22,5 +35,9 @@ Alee requires `make` and a C++17-compatible compiler.
 
 To compile, simply run the `make` command. This will produce a library, `libalee.a`, as well as a REPL binary named `alee`.  
 A `small` target exists that optimizes the build for size.  
-A `fast` target exists that optimizes for maximum performance on the host (not target) system.
+A `fast` target exists that optimizes for maximum performance on the host system.
+The `standalone` target will produce a `alee-standalone` binary that contains and pre-loads the core dictionary.
+The `msp430` target builds Alee for the [MSP430G2553](https://www.ti.com/product/MSP430G2553) microcontroller. Like `standalone`, the core dictionary is built into the binary.
+
+Configurable constants and types are defined either in the Makefile or in `types.hpp`.
 
diff --git a/alee-msp430.cpp b/alee-msp430.cpp
index 00151f0..7c82c03 100644
--- a/alee-msp430.cpp
+++ b/alee-msp430.cpp
@@ -17,10 +17,12 @@
  */
 
 #include "alee.hpp"
-#include "memdict.hpp"
+#include "splitmemdict.hpp"
 
 #include <msp430.h>
 
+#include "core.fth.h"
+
 static char strbuf[32];
 
 static void readchar(State& state);
@@ -47,15 +49,10 @@ int main()
 
     __enable_interrupt();
 
-    static MemDict dict;
+    static SplitMemDict<alee_dat_len> dict (alee_dat);
     State state (dict, readchar);
     Parser parser;
 
-    dict.write(Dictionary::Base, 10);
-    dict.write(Dictionary::Latest, Dictionary::Begin);
-    dict.write(Dictionary::Compiling, 0);
-    dict.write(Dictionary::Postpone, 0);
-
     serputs("alee forth\n\r");
 
     auto ptr = strbuf;